JPH0337055Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is placed in front of the display screen of a CRT, etc.
The present invention relates to a light-transmissive touch panel that detects the coordinate position of a point pressed with a fingertip, a pen, or the like.

[Conventional technology]

Coordinate input devices that use a touch panel that transmits light are installed in front of the display screen of a CRT, LCD (liquid crystal display), etc., and can be used to input various types of information by pressing the touch panel surface while viewing the display screen. It is designed to perform operations.

Figures 3 to 5 show conventional examples, and Figure 3 shows the first example.
4 and 5 are cross-sectional views showing second and third examples in which a display sheet and a shield plate are attached to the touch panel of FIG. 3, respectively.

In FIG. 3 showing the first example, 1 is an upper electrode sheet formed by forming ITO etc. on a transparent film and has a refractive index of about 1.5, and 2 is an upper electrode sheet formed by forming ITO etc. on a transparent film. 3 is the lower electrode sheet 2 which constitutes the lower electrode and has a refractive index of about 1.5.
a dot spacer made of an insulator formed on the
4 is made of synthetic resin, glass, etc., and has a refractive index of approximately 1.5.
The transparent holding plate includes the upper electrode sheet 1 and the lower electrode sheet 2, and the lower electrode sheet 2 and the holding plate 4.
and are adhered together outside the area of the display surface of the CRT with a double-sided adhesive tape 5 that does not require light transmission, thereby forming a transparent touch panel. Such a touch panel is attached to the front of the display surface of a CRT, etc., and is connected to the opposing upper electrode by pressing the upper electrode sheet 1 with a fingertip or pen tip while visually checking the display surface of the CRT. The coordinates of the location where the lower electrode contacts and presses are detected.

Further, in FIG. 4 showing the second example, 6 is a display sheet with a refractive index of about 1.5 made of a transparent film such as polyester or polycarbonate, and 7 is a display sheet with a refractive index of about 1.5 made by forming ITO or the like on a transparent film. The shield plate 7 removes static electricity generated on the surface of the CRT. Then, the display sheet 6, the upper electrode sheet 1, and the shield plate 7
and the holding plate 4 are bonded together with tape 5 outside the area of the display surface. There are no other differences from Fig. 3 in other respects. Furthermore, FIG. 5, which shows the third example, shows a case in which the shield plate 7 is also attached between the holding plate 4 and the lower electrode sheet 2. In this case, the lower electrode sheet 2
and the shield plate 7, and the shield plate 7 and the holding plate 4 are bonded with tape 5 outside the area of the display surface, which is the same as the second example shown in FIG.

[The problem that the idea attempts to solve]

By the way, in the conventional touch panel shown in FIG. 3, there are air spaces between the upper electrode sheet 1 and the lower electrode sheet 2, and between the lower electrode sheet 2 and the holding plate 4. When pressed with the tip, the upper electrode sheet 1 easily bends (the stroke at the time of pressing is approximately 0.4 mm to 0.6 mm), is soft to the touch, and has a poor operational feel. 1) and the holding plate 4 and the upper and lower electrode sheets 1 and 2, the refractive index is significantly different, so attenuation of light occurs at each interface.
There was a drawback that the display surface on the CRT could not be seen from the front of the upper electrode sheet 1.

Both the conventional examples shown in FIGS. 4 and 5 have the same drawbacks as the one shown in FIG. 3.

The present invention is intended to solve the above-mentioned drawbacks of the conventional technology, and an object of the present invention is to provide a transparent touch panel that provides a good operating feel and less attenuation of light.

[Means to solve the problem]

In order to achieve the above object, the present invention has a structure in which at least one of a display sheet and a shield plate, an upper electrode sheet, a lower electrode sheet, and a holding plate are laminated, and each electrode is placed opposite to the other. All of the above laminated members except between the laminated upper electrode sheet and lower electrode sheet are adhered with a transparent double-sided holding tape having a refractive index close to that of both electrode sheets and the retaining plate. This is a characteristic feature.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a cross-sectional view of a touch panel according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of a touch panel according to a second embodiment of the present invention, and FIGS.
The same parts as those of the conventional example shown in the figure are given the same reference numerals, and detailed explanation will be omitted.

The first embodiment shown in FIG. 1 corresponds to the conventional example shown in FIG. 4, and the difference from the conventional example shown in FIG. In place of the double-sided adhesive tape 5, a transparent double-sided adhesive tape 8b that covers the entire surface of both and has a refractive index of approximately 1.5, which is approximately 1.5, is provided between the lower electrode sheet 2 and the holding plate 4. , a transparent double-sided adhesive tape 8b is provided instead of the conventional double-sided adhesive tape 5, which covers the entire surface of both and has a refractive index of approximately 1.5, which is approximately 1.5 to the refractive index of both of the holding plate 4 and the shield plate 7. In between, instead of the conventional double-sided adhesive tape 5, a transparent double-sided adhesive tape 8c is provided which covers the entire surface of both and has a refractive index of about 1.5, which is approximately 1.5 of the refractive index of both, and other points. There is no change. In addition, double-sided adhesive tape 8
a, 8b, and 8c may be made of the same material, or may have similar refractive indexes.

Comparing the embodiment shown in FIG. 1 with the conventional example shown in FIG. Since there is no layer, even if the display sheet 6 is pressed, it does not bend easily and feels hard, making the operation feel better than before. In addition, the transparent double-sided adhesive tapes 8a, 8b, and 8c have a refractive index.
1.5, display sheet 6, upper and lower electrode sheets 1,
2. The refractive index is approximate to that of the retainer plate 4 and the shield plate 7, and therefore the interface between the display sheet 6 and the upper electrode sheet 1 and the tape 8b, and the interface between the lower electrode sheet 2 and the retainer plate 4 and the tape 8a. , the attenuation of light at the interface between the holding plate 4 and the shielding plate 7 and the tape 8c is less than in the past, and
You can clearly see the CRT display screen.

The second embodiment shown in FIG. 2 corresponds to the conventional example shown in FIG. 5, and the difference between the two is that between the display sheet 6 and the upper electrode sheet 1 shown in FIG.
In place of the conventional double-sided adhesive tape 5, a transparent double-sided adhesive tape 8b is provided which covers the entire surface of both and has a refractive index of about 1.5 which is similar to the refractive index of both.
Between the conventional holding plate 4 and the shield plate 7, instead of the conventional double-sided adhesive tape 5, a double-sided adhesive tape 8d is provided which is transparent, covers the entire surface of both, and has a refractive index of about 1.5, which is approximately the same as the refractive index of both. points, and
Between the lower electrode sheet 2 and the shield plate 7, instead of the conventional double-sided adhesive tape 5, a transparent double-sided adhesive tape 8e is provided which covers the entire surface of both and has a refractive index of about 1.5, which is approximate to the refractive index of both. and
There are no differences in other respects. In addition, 8b, 8d, 8
e may be made of the same material or may have a similar refractive index.

When comparing the second embodiment shown in FIG. 2 with the conventional example shown in FIG. Since there is no air layer between them as in the conventional example shown in FIG. 5, the display sheet 6 does not easily bend when pressed and feels stiff, so the operating feel can be improved compared to the conventional example. Transparent double-sided adhesive tape 8 is used instead of the air layer in the conventional example shown in Figure 5.
b, 8d, 8e are included, and double-sided adhesive tape 8
The refractive index of b, 8d, and 8e is about 1.5, and the display sheet 6, upper and lower electrode sheets 1 and 2, shield plate 7,
Since it approximates the refractive index of the holding plate 4, the interface between the display sheet 6 and the upper electrode sheet 1 and the tape 8b, the interface between the lower electrode sheet 2 and the shield plate 7 and the double-sided adhesive tape 8e, and the interface between the shield plate 7 The attenuation of light at the interface between the holding plate 4 and the double-sided adhesive tape 8d is reduced compared to the conventional example shown in FIG. 5, and the surface of the CRT can be clearly seen from above the display sheet 6.

[Effect of idea]

As explained above, according to the present invention, all the laminated members except for the areas where the electrodes of the upper electrode sheet and the lower electrode sheet face each other are transparent double-sided materials whose refractive indexes approximate the refractive index of both electrode sheets and the holding plate. Since it is bonded with adhesive tape without an air layer, it can reduce deflection when pressed, and
Attenuation of light between the laminated members can be reduced, and a touch panel with a good operating feel and excellent visibility can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a touch panel according to a first embodiment of the present invention, FIG. 2 is a sectional view showing a touch panel according to a second embodiment of the present invention, and FIGS. 3 to 5 are conventional examples. FIG. 3 is a sectional view showing a first example, FIG. 4 is a sectional view showing a second example, and FIG. 5 is a sectional view showing a third example. DESCRIPTION OF SYMBOLS 1... Upper electrode sheet, 2... Lower electrode sheet, 3... Dot baser, 4... Holding plate, 5...
...Double-sided adhesive tape, 6... Display sheet, 7... Shield plate, 8a, 8b, 8c, 8d, 8e... Double-sided adhesive tape.

Claims (1)

[Scope of utility model registration request] At least one of a display sheet and a shield plate;
An upper electrode sheet, a lower electrode sheet, and a holding plate are laminated, and all of the above laminated members except between the upper electrode sheet and the lower electrode sheet, where the respective electrodes are laminated facing each other, are stacked on both electrodes. A touch panel characterized in that the touch panel is adhered by a transparent double-sided adhesive tape having a refractive index close to that of the sheet and the holding plate.